Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
5 */
6
7#ifndef _ASM_X86_STACKTRACE_H
8#define _ASM_X86_STACKTRACE_H
9
10#include <linux/uaccess.h>
11#include <linux/ptrace.h>
12#include <asm/switch_to.h>
13
14enum stack_type {
15 STACK_TYPE_UNKNOWN,
16 STACK_TYPE_TASK,
17 STACK_TYPE_IRQ,
18 STACK_TYPE_SOFTIRQ,
19 STACK_TYPE_EXCEPTION,
20 STACK_TYPE_EXCEPTION_LAST = STACK_TYPE_EXCEPTION + N_EXCEPTION_STACKS-1,
21};
22
23struct stack_info {
24 enum stack_type type;
25 unsigned long *begin, *end, *next_sp;
26};
27
28bool in_task_stack(unsigned long *stack, struct task_struct *task,
29 struct stack_info *info);
30
31int get_stack_info(unsigned long *stack, struct task_struct *task,
32 struct stack_info *info, unsigned long *visit_mask);
33
34const char *stack_type_name(enum stack_type type);
35
36static inline bool on_stack(struct stack_info *info, void *addr, size_t len)
37{
38 void *begin = info->begin;
39 void *end = info->end;
40
41 return (info->type != STACK_TYPE_UNKNOWN &&
42 addr >= begin && addr < end &&
43 addr + len > begin && addr + len <= end);
44}
45
46#ifdef CONFIG_X86_32
47#define STACKSLOTS_PER_LINE 8
48#else
49#define STACKSLOTS_PER_LINE 4
50#endif
51
52#ifdef CONFIG_FRAME_POINTER
53static inline unsigned long *
54get_frame_pointer(struct task_struct *task, struct pt_regs *regs)
55{
56 if (regs)
57 return (unsigned long *)regs->bp;
58
59 if (task == current)
60 return __builtin_frame_address(0);
61
62 return &((struct inactive_task_frame *)task->thread.sp)->bp;
63}
64#else
65static inline unsigned long *
66get_frame_pointer(struct task_struct *task, struct pt_regs *regs)
67{
68 return NULL;
69}
70#endif /* CONFIG_FRAME_POINTER */
71
72static inline unsigned long *
73get_stack_pointer(struct task_struct *task, struct pt_regs *regs)
74{
75 if (regs)
76 return (unsigned long *)kernel_stack_pointer(regs);
77
78 if (task == current)
79 return __builtin_frame_address(0);
80
81 return (unsigned long *)task->thread.sp;
82}
83
84void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
85 unsigned long *stack, char *log_lvl);
86
87extern unsigned int code_bytes;
88
89/* The form of the top of the frame on the stack */
90struct stack_frame {
91 struct stack_frame *next_frame;
92 unsigned long return_address;
93};
94
95struct stack_frame_ia32 {
96 u32 next_frame;
97 u32 return_address;
98};
99
100static inline unsigned long caller_frame_pointer(void)
101{
102 struct stack_frame *frame;
103
104 frame = __builtin_frame_address(0);
105
106#ifdef CONFIG_FRAME_POINTER
107 frame = frame->next_frame;
108#endif
109
110 return (unsigned long)frame;
111}
112
113#endif /* _ASM_X86_STACKTRACE_H */